First confirmed particle made of four quarks

Four Quarks

Physicists have resurrected a particle that may have existed in the first hot moments after the Big Bang, reports Nature:

Arcanely called Zc(3900), it is the first confirmed particle made of four quarks, the building blocks of much of the Universe’s matter. Until now, observed particles made of quarks have contained only three quarks (such as protons and neutrons) or two quarks (such as the pions and kaons found in cosmic rays). Although no law of physics precludes larger congregations, finding a quartet expands the ways in which quarks can be snapped together to make exotic forms of matter.

The BESIII detector in China (pictured) is “one of two experiments to detect four-quark particles”. Read more here.